Gas effusion

1. it takes 354 seconds for 1.00 ml of xe to effuse through a small hole. under the same conditions, how long will it take for 1.00 ml of nitrogen to effuse?

2.what is the rate of effusion for a gas that has a molar mass twice that of a gas that effuses at a rate of 4.2 mol/min?

3. it takes 110. seconds for a sample of carbon dioxide to effuse through a porous plug and 275 seconds for the same volume of an unknown gas to effuse under the same conditions. what is the molar mass of the unknown gas (in g/mol)?

4. if a gas effuses 4.25 times faster than iodine gas (i2), what is its molar mass?

5. calculate the density of a gas at stp, if a given volume of the gas effuses through an apparatus in 6.60 min and the same volume of nitrogen, at the same temperature and pressure, effuses through this apparatus in 8.50 minutes.

ideal vs non-ideal gases

an ideal gas is one in which the molecules don't interact with each other and don't take up any space. in an ideal world, collisions between gas molecules are completely elastic. all gases in the real world have molecules with diameters and which interact with each other, so there's always a bit of error involved in using any form of the ideal gas law and van der waal's equation.

however, noble gases act much like ideal gases because they don't participate in chemical reactions with other gases. helium, in particular, acts like an ideal gas because each atom is so tiny.

other gases behave much like ideal gases when they are at low pressures and temperatures low pressure means few interactions between gas molecules occur . low temperature means the gas molecules have less kinetic energy, so they don't move around as much to interact with each other or their container.

a 4.25-l flask contains 3.46 mol co2 :

(a) from the ideal gas law
(b) from the van der waals equation
(c) explain the reason(s) for the difference 229 °c. calculate the pressure of this sample of co2